package com.shf4;

import org.junit.Test;

public class IDEADebug {
  @Test
  public void testStringBuffer(){
    String str=null;
    StringBuffer sb=new StringBuffer();
    sb.append(str);

    System.out.println(sb.length());
    System.out.println(sb);

    StringBuffer sb1 = new StringBuffer(str);
    System.out.println(sb1);
  }
}
